413 



This species seems to \)r somewhat variable in sculpture and colour, the spiral lirac of 

 penultimate whorl, vary in number from 3 to 5; in the specimens from Stat. i6.\, not only the 

 infi'asutural keel is adorned with red-brown dots, but also the principal lirac on many places. 

 As Tkvox, who has [jrobably not known the species, enumerates it amonj^st his synonyms of 

 7\ si;n'?is/s and gives only a rude copy of Weinkauff's rather rude figm-e, I have not (pioted 

 that author. 



18. Drillia stcrrha Watson. 



Watson, rrelim. Report, Challenger Moll, journ. Linn. Soc. Lond. Vol. XV, 1881, p. 426. 

 Report of the Challenger-Gastrop. p. 305, PI. 21, fig. 3. 



Stat. 162. Between Loslos and Broken-island.s. West of Salawatti. 18 M. Coarse and fme 



sand with clay and shells, i Spec. 

 Stat. 164. i°42'.5 S., I30°47'.5E. Near West New-Guinea. 32 M. Sand, small stones and 



shells. 3 Spec. 



The upper part of the ribs below the excavation, seems to be a little more angular 

 than in Watson's figure, and the number of ribs on last whorl of the largest specimen is 14, 

 otherwise I find no differences of any importance. 



19. Drillia regia (Beck) Reeve. 



Reeve. Conch. Syst. Vol. II, p. 187, PI. 233, fig. 7. 



Conch. Ic. Vol. I, Pleurotoma, fig. 75. 



Weinkauff. Martini-Chemn. Conch. Cab. Ed. II, Vol. IV, Pleurotoma, p. 75, PI. 16, fig. 1,3. 

 Tryon. Man. of Conch. Vol. VI, p. 201, PI. 11, fig. 80. 



Stat. 66. Bank between Bahuluwang and Tambolungan, South of Saleyer. 8 — 10 M. Dead 



coral, Halimeda, Lithothamnion. i Spec. 

 Stat. 315. East of Sailus Besar, Paternoster-islands. Up to 36 M. Coral and Lithothamnion. i Spec. 



Beck's name was only a manuscript-name, so I have quoted Reeve as the author. The 

 sculpture is sharper than in Reeve's figure, more like that of Weinkauff. After receiving specimens of 

 D. Roitgeyroni Souv. (Journ. de Conch., 1874, p. 187, PI. 7, fig. i), I scarcely can find diffe- 

 rences of much importance, which could not be ascribed in part to the state of preservation 

 of the specimens. Souverbie's much more detailed description is very well applicable to the 

 Siboga-specimens. If the two species ought to be united, the name affixed by Reeve should 

 have priority. Mr. Le Bockton Tomlin (Journ. of Conch. Vol. XIII, 19 10, p. 43) thinks the 

 two are different. 



20. Drillia radula Hinds. 



Hinds. Proc. Zool. Soc Lond. 1834, p. 16. 



Reeve. Conch. Ic. Vol. I, Pleurotoma, fig. 223. 



Weinkauff. Martini-Chemn. Conch. Cab. Ed. II, Vol. IV, Pleurotoma, p. 90, PI. 19, fig. 4, 6. 



Tryon. Man. of Conch. Vol. VI, p. 241, PI. 7, fig. 89. 



Stat. 51. Madura-bay. 69 — 91 M. Fine grey sand, coarse sand with shells and stones, i Spec. 

 Stat. 104. Sulu harbour, Sulu-island. 14 M. Sand, i Spec. 



49 



SIBOGA-EXPEDITIE XLIX'^. 54 



